Genesis 6:1-4 King James Version (KJV)
6 And it came to pass, when men began to multiply on the face of the earth, and daughters were born unto them,
2 That the sons of God saw the daughters of men that they were fair; and they took them wives of all which they chose.
3 And the Lord said, My spirit shall not always strive with man, for that he also is flesh: yet his days shall be an hundred and twenty years.
4 There were giants in the earth in those days; and also after that, when the sons of God came in unto the daughters of men, and they bare children to them, the same became mighty men which were of old, men of renown.
Genesis 6:1-4 Amplified Bible, Classic Edition (AMPC)
6 When men began to multiply on the face of the land and daughters were born to them,
2 The sons of God saw that the daughters of men were fair, and they took wives of all they desired and chose.
3 Then the Lord said, My Spirit shall not forever dwell and strive with man, for he also is flesh; but his days shall yet be 120 years.
4 There were giants on the earth in those days—and also afterward—when the sons of God lived with the daughters of men, and they bore children to them. These were the mighty men who were of old, men of renown.
Genesis 6:1-4 Living Bible (TLB)
6 1-2 Now a population explosion took place upon the earth. It was at this time that beings from the spirit world[a] looked upon the beautiful earth women and took any they desired to be their wives. 3 Then Jehovah said, “My Spirit must not forever be disgraced in man, wholly evil as he is. I will give him 120 years to mend his ways.”
4 In those days, and even afterwards, when the evil beings from the spirit world were sexually involved with human women, their children became giants, of whom so many legends are told.